[DanBC]

Look at something like cholesterol. We used to think high blood cholesterol was caused by a diet high in saturated fat, and that this was a causal risk factor for hear attack.

Now we've modifed that a bit and some doctors think that saturated fat isn't as terrible as it was and that sugar is the actual problem: http://www.nhs.uk/news/2013/10October/Pages/Saturated-fat-li...

If we got that wrong how well are going to do with all the micronutrients and other stuff that is in real food?

Soylent had a terrible, unethical, marketing campaing during its kickstarter. (Probably illegal in the US - it made medical claims) but they seem to be a lot more careful about that kind of stuff now.

If you're going to use any of the meal replacement products (there are loads on the market) you don't have to give up real food. You can still eat fruit and veg alongside your nutrient-gloop.